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I have recently decat my Focus St170 however now the engine management light has come on. I heard about chiping the second lamba sensor but can't find one. Can anyone help.

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Hi i had same problem with mine,replacing lambda can sometimes cure it. There's one in front of cat and one after it cost about £75 each. I have a Bluefin Superchip and you can read any diagnostic codes with this and also reset the management light. Chip costs around £275 and is a handheld device that you plug into diagnostic port under steering wheel,its a simple D.I.Y job. Hope this is helpful,good luck...